Poland is signed up to the EHIC scheme (European Health Insurance Card) as is the UK.
If medical care is free in Poland (i'm hazy on that) as it is in the UK, then in each participating EU member state, it is also free on production of said card.
No voodoo involved. :)
Related:
General Practitioners - trouble finding work in the UK?Hi there, just a quick enquiry. Are there any fully qualified GPs on this forum that have been wanted to work in the UK, but have had trouble doing so, for whatever reason?
One of the reasons could be there's more competition in the UK from low-wage countries and Polish MDs are not that cheap. It applies to UK doctors too.